2009 HL21

NEO MOID ⇩ IMP ⇩ COV ★ EPH ⇩ OBS
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.4447332174 ± 6.32e-07
Semi-major axis (a)1.6637403526 AU ± 6.48e-09
Inclination (i)1.00992764° ± 4.84e-06
Long. of Asc. Node (Ω)144.32727115° ± 9.27e-04
Arg. of Perihelion (ω)9.46009792° ± 1.03e-03
Mean Anomaly (M)284.40259320° ± 3.15e-05
Mean Motion (n)0.4592867863°/day ± 2.68e-09
Perihelion dist (q)0.92381975 AU ± 1.05e-06
Aphelion dist (Q)2.40366095 AU ± 1.05e-06
Orbital Period2.14599312 yr ± 1.25e-08
Physical Parameters
H (abs. magnitude)22.55
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-06-01
RMS Residual0.318″
Uncertainty0
Orbit TypeApollo
MOID0.007908 AU
Observations Used137
Oppositions8
Arc Total2009-2024
First Observation Used2009-04-20
Last Observation Used2024-05-08
Observations (138)
Date Type RA Dec Mag Band Observatory
2009-04-22 19:51:25 C 13 53 44.53 +01 56 08.1 o A99
2009-04-22 19:57:14 C 13 53 45.43 +01 55 51.7 o A99
2009-04-22 20:08:57 C 13 53 47.16 +01 55 19.2 o A99
2009-04-22 20:12:40 C 13 53 47.53 +01 55 03.4 o A74
2009-04-22 20:14:43 C 13 53 48.01 +01 55 02.9 o A99
2009-04-22 20:20:15 C 13 53 48.68 +01 54 41.7 o A74
2009-04-22 20:27:25 C 13 53 49.75 +01 54 21.9 o A74
2009-04-22 20:40:18 C 13 53 51.67 +01 53 45.4 o A74
2009-04-22 22:27:07 C 13 54 07.09 +01 48 55.9 w 160
2009-04-22 22:30:40 C 13 54 07.59 +01 48 45.9 w 160
2009-04-22 22:34:11 C 13 54 08.09 +01 48 36.1 w 160
2009-04-22 23:01:09 C 13 54 12.12 +01 47 11.0 r 621
2009-04-22 23:04:57 C 13 54 12.64 +01 47 01.1 r 621
2009-04-22 23:05:47 C 13 54 12.49 +01 47 06.3 c A53
2009-04-22 23:08:45 C 13 54 13.17 +01 46 50.2 r 621
2009-04-22 23:11:03 C 13 54 13.29 +01 46 50.9 c A53
2009-04-23 06:58:57 C 13 55 26.20 +01 25 54.3 r H45
2009-04-23 07:00:35 C 13 55 26.41 +01 25 50.1 r H45
2009-04-23 07:01:44 C 13 55 26.57 +01 25 47.0 r H45
2009-04-23 07:02:33 C 13 55 26.68 +01 25 44.7 r H45
2009-04-23 07:04:17 C 13 55 26.92 +01 25 40.5 r H45
2009-04-23 07:05:52 C 13 55 27.11 +01 25 36.1 r H45
2009-04-23 07:07:48 C 13 55 27.37 +01 25 30.9 r H45
2009-04-23 07:09:29 C 13 55 27.58 +01 25 26.1 r H45
2009-04-23 07:10:57 C 13 55 27.79 +01 25 22.5 r H45
2009-04-23 08:06:19 C 13 55 34.87 +01 22 48.6 o H55
2009-04-23 08:11:08 C 13 55 35.52 +01 22 35.9 o H55
2009-04-23 08:13:33 C 13 55 35.85 +01 22 29.4 o H55
2009-04-23 08:15:58 C 13 55 36.19 +01 22 23.0 o H55
2009-04-24 22:07:58 C 14 00 58.89 -00 09 30.0 o 046
2009-04-24 22:09:46 C 14 00 59.11 -00 09 34.7 o 046
2009-04-24 22:11:24 C 14 00 59.28 -00 09 38.6 o 046
2009-04-24 22:13:07 C 14 00 59.45 -00 09 41.7 o 046
2009-04-24 22:14:38 C 14 00 59.61 -00 09 45.6 o 046
2009-04-24 22:16:12 C 14 00 59.84 -00 09 49.6 o 046
2009-04-24 22:17:48 C 14 01 00.00 -00 09 52.7 o 046
2009-04-24 22:19:23 C 14 01 00.11 -00 09 54.7 o 046
2009-04-24 22:20:54 C 14 01 00.31 -00 09 59.4 o 046
2009-04-24 22:22:28 C 14 01 00.47 -00 10 03.4 o 046
2009-04-25 00:25:35 C 14 01 14.23 -00 14 35.8 r B01
2009-04-25 00:32:14 C 14 01 14.95 -00 14 50.3 r B01
2009-04-25 00:34:26 C 14 01 15.20 -00 14 55.0 r B01
2009-04-25 00:43:18 C 14 01 16.14 -00 15 14.5 r B01
2009-04-25 00:47:44 C 14 01 16.63 -00 15 24.2 r B01
2009-04-25 00:52:10 C 14 01 17.12 -00 15 34.0 r B01
2009-04-25 02:35:52 C 14 01 28.63 -00 19 19.4 r B01
2009-04-25 02:44:43 C 14 01 29.63 -00 19 38.6 r B01
2009-04-26 07:03:50 C 14 04 50.40 -01 17 02.0 18.3 c 704
2009-04-26 07:20:11 C 14 04 51.81 -01 17 33.3 18.6 c 704
2009-04-26 07:36:34 C 14 04 53.26 -01 18 04.5 18.5 c 704